IMO, you would be using too much leverage to go from one property to three properties. Even if they cash flow now, things go wrong with the house or renters or both, etc. You could really end up in trouble. If you need to buy a primary residence, I can see doing a cash out refi on the rental to help with that.
Revisit the idea of buying more rentals when you have more equity, more cash on hand, more in your 401k, and more take-home pay, all of which would provide a greater safety net.